#include<stdio.h>
#include<iostream>
int katel[]={1, 1, 2, 5, 14, 42, 132, 429, 1430, 4862, 16796, 58786, 208012, 742900, 2674440, 9694845, 35357670, 129644790, 477638700}; 
using namespace std;
int main(){
	int n;
	cin>>n;
	cout<<katel[n];

	return 0;
}

